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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d3aff6e86d3a666123c3b67901a0b1af9ccbf0389f72a0c6af882926dd1d3d' 
  AND token = 'bsIMV1n9vpuT83YyJa8Khb5/LmFkOrLC/JBektu/D/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}